Stereoscope-frame



(No Model.)

H. S. WALBRIDGE.

STBREOSOOPE FRAME.

No. 590,922. Patented Sept. 28,1897.

IN VE N TOR r B an/M ATTORNEYS.

UNrTED STATES- PATENT rFrcE.

HERBERT S. \(VALBRIDGE, OF NORTH BENNINGTON, VERMONT.

STEREOSCQPE-FRAM E.

SPECIFICATION forming part of Letters Patent No. 590,922 dated September28, 1 897.

Applioation'filecl May 20, 1896. Serial No. 592,304 (No model.)

To aZZ whom it may concern.-

Be it known that I, HERBERT S. WAL- BRIDGE, of North Bennington, in thecounty of Bennington and State of Vermont, have invented a new andImproved stereoscope- Frame, of which the following is a full, clear,and exact description.

This invent-ion relates to the frames or holders for portablestereoscopes, and has for its object to provide novel features ofconstruction for a device of the indicated character which will renderthe holder or frame more efficient in service and also adapt it forrapid production, the improved frame being very light,strong, anddurable, as well as shapely and neat in appearance.

The invention consists in the novel construction and combination ofparts, as is hereinafter described, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part ofthis specification,

in which similar characters of reference inclicate corresponding partsin all the figures.

Figure 1 is a side elevation of the improved frame having one side ofthe hood removed to expose novel interior details. Fig. 2 is a plan viewof the frame having the upper side of the hood broken away. Fig. 3 is afront end view of the improved frame, and Fig. 4 is a similar view of aslightly-modified form of the improvement.

The frame-bar 10 is of usual form, having a foldable handle 11 and theerect longitudinallyeextended partition-wall 12 common to the class ofoptical instruments under consideration. On the front end of theframe-bar 10 the hood 13 is mounted, said hood having an end wall 14,that is apertured at two points suitably spaced' apart and containingthe lenses 15, that are of the usual construction.

The partition 12 joins at its front end with the transverse wall 14 ofthe hood 13 and is located midway between the lenses 15, thus conducingto the efiective superposition of one picture on the other to produce anappearance of solidity, that is the distinguishing feature of thestereoscopic instrument.

The hood 13 is preferably of a substantially elliptical form, as bestshown in Figs. 3 and 4, and in the plan of construction represented inFig.3 the laterally-elongated wall of the hood is slotted from front torear on the lower side, this being the ordinary way in which ellipticalhoods for stereoscopes are made.

The feature of improvement consists in providing a novel bridge-piece 16for the hood 13, which part 16 is constructed, essentially, as shown inthedrawings and comprises an inverted substantially V -shapedwall-section that in place affords a division-wall a, which centrallyprojects up between the lenses 15. The bri dge-wall is preferablycomposed of two curved pieces of like form, these having one end of eachone secured together and their opposite ends affixed on the hood-wallnear the edges of the gap in its lower side, the convex surfaces of thepieces that form the bridgepiece being exteriorly disposed, so that ineffeet the members of the bridge-piece become extensions of theelliptical hood atits lower side.

It will be seen in Figs. 1 and 2 thatthe corners of the hood13 at itsfront edge and below the center of height are conveXly curved, as arealso the forward edges of the bridgepiece sections, and the front edgesof the latter are sloped toward the cross-wall 14 of the hood, wherebythe contour of the j oined hood and bridge-piece on their forward edgesis rendered substantially concave for a proper contact with the face ofa person who applies the hood thereto in using the instrument.

Owing to the construction of the bridge piece 16 it will contact withthe surface of the nose when the stereoscope is in use, thereby closingthe opening in the lower part of the hood and thus effectually excludingthe light, and as the ends of the bridge-piece extend up between thelenses and are secured to the end wall ofv the hood they form apartition between the lenses, so that each eye can only see through thelens directly in front of it. It will thus be seen that by theemployment of the bridge-piece the efficiency of the stereoscope isgreatly increased and at a small cost.

In Fig. 4 the bridge-piece 16 is shown as integrally formed with theWallof the hood 13 by simply extending the latter upwardly from theframe-bar 10 and joining the ends by a clip-plate or any other means.

In use the modified form of the bridge-piece and hood affords all theadvantages that pertain to the attached bridge-piece, and in some casesit may be preferred to construct the latter integral with the hood, asshown and described.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. A stereoseope having its hood provided at its lowerportion with curved extensions having inclined front edges and extendingupwardly between the lenses into contact with each other and secured tothe end wall of the hood, whereby the lowerportion of the hood will beclosed to effectually exclude the light and a partition formed betweenthe lenses, as and for the purpose set forth.

2. In a stereoscope, the combination with the hood having its lower sideopen from front to rear, of a substantially inverted V-shapedbridge-piece arranged in the open side of the hood and extending upbetween the lenses of the rear wall of the hood and secured thereto,said bridge-piece consisting of two curved pieces having inclined frontedges and secured to the hood and to each other, substantially as hereinshown and described. I

HERBERT Sv XVALBRIDGE.

\Vitnesses VALTER R. \VHITE, HENRY S. TALBRIDGE.

